KR20180099085A - An optical fiber sensor for measuring the concentration of copper ion in water and a measurement system of copper concentration using the same - Google Patents

Abstract

The present invention relates to an optical fiber sensor for measuring the concentration of a copper ion in water and a system for measuring the concentration of a copper ion by using the same. More specifically, according to one embodiment of the present invention, provided is the optical fiber sensor for measuring the concentration of a copper ion in water, including a sensor unit, wherein a reactant responding to fluids and changing colors in accordance with the concentration of the copper ion is embedded, so that the concentration of the copper ion in water can be easily measured. Moreover, the optical fiber sensor is disposed at one end of an optical fiber, where light is vertically transmitted to be reflected in a reflecting body and then incident, thereby facilitating an approach to the water environment.

Description

[0001] The present invention relates to an optical fiber sensor for measuring the concentration of copper ions in water, and an optical fiber sensor for measuring the concentration of copper ions using the same.

The present invention relates to an optical fiber sensor for measuring the concentration of copper ions in water and a copper ion concentration measuring system using the same.

Due to industrial development, the kinds and quantity of environmental pollutants are rapidly increasing, and the safety and health of mankind are seriously threatened. Among the many environmental pollutants, heavy metals are a harmful source of pollutants that cause various toxicities and diseases.

It is also important to prevent environmental pollution by heavy metals because most of the heavy metals released into natural ecosystems are not decomposed, they are absorbed by microorganisms and then transferred directly to higher organisms including humans through continuous food chains .

In order to prevent environmental pollution caused by heavy metals, technology should be provided so that heavy metals can be detected accurately and quickly at low concentrations in real time. In particular, much of the overall disease suffered by humans is closely related to the water environment such as contaminated water or food, and research is underway to detect heavy metals in aqueous environments.

In this connection, researches for detecting heavy metals have been conducted, but no sensor capable of effectively detecting Cu has been developed.

In particular, copper is a heavy metal that flows into mines, paints, textile timber factories, etc., into the environment and can enter the human or animal body, causing copper poisoning if an excessive amount of copper is detected.

In such cases, copper poisoning may cause vomiting, blood clots, hypertension, jaundice, and gastrointestinal disturbances.

Therefore, there is a need for a sensor for copper ion measurement which can measure the concentration of copper easily in real time in a water environment.

Korean Patent No. 10-1557458

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an optical fiber sensor for measuring the concentration of copper ions in water, .

In order to achieve the above object,

In one embodiment of the invention,

An optical fiber for transmitting light;

A housing into which one end of the optical fiber is inserted and in which a space is formed; And

A sensor unit formed at a position opposite to one end of the optical fiber in the housing and impregnated with a reaction material that changes color depending on the concentration of copper ions in the fluid in reaction with the fluid; The present invention provides an optical fiber sensor for measuring the concentration of copper ions in water.

The optical fiber sensor for measuring the concentration of copper ions in the water according to an embodiment of the present invention includes a sensor unit impregnated with a reactive material which changes in color depending on the concentration of copper ions in the fluid in reaction with the fluid, The concentration of ions can be easily measured.

Particularly, the optical fiber sensor is disposed at one end of the optical fiber which is vertically transmitted by the light, reflected by the reflector, and then incident again, so that the optical fiber sensor is easily accessible to the water environment.

In addition, according to another embodiment of the present invention, the copper ion concentration measuring system using the optical fiber sensor for measuring the copper ion concentration in the water is sent from the light source that generates the light, and the reflected light is transmitted to the optical signal processor And the concentration value of the copper ion can be easily confirmed through the spectrum or the absorbance to the optical output unit.

1 is a configuration diagram of an optical fiber sensor according to an embodiment of the present invention.
2 is a configuration diagram of a copper ion concentration measuring system using an optical fiber sensor for measuring the concentration of copper ions in a water quality according to another embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, the present invention will be described in detail.

The present invention, in one embodiment,

An optical fiber for transmitting light;

A housing into which one end of the optical fiber is inserted and in which a space is formed; And

A sensor unit formed at a position opposite to one end of the optical fiber in the housing and impregnated with a reaction material that changes color depending on the concentration of copper ions in the fluid in reaction with the fluid; The present invention provides an optical fiber sensor for measuring the concentration of copper ions in water.

More specifically, the optical fiber sensor for measuring the concentration of copper ions in the water according to an embodiment of the present invention includes a sensor unit impregnated with a reactive material that changes color depending on the concentration of copper ions in the fluid in reaction with the fluid , The concentration of copper ions in the water quality can be easily measured.

Particularly, the optical fiber sensor is disposed at one end of the optical fiber which is vertically transmitted by the light, reflected by the reflector, and then incident again, so that the optical fiber sensor is easily accessible to the water environment.

1 is a configuration diagram of an optical fiber sensor according to an embodiment of the present invention.

Hereinafter, an optical fiber sensor according to an embodiment of the present invention will be described in detail with reference to FIG.

1, an optical fiber sensor 100 according to an embodiment of the present invention includes an optical fiber 110, a housing 130 into which the optical fiber is inserted, and a sensor unit 140 included in the housing 130 do.

First, the optical fiber 110 may be a glass optical fiber including a core made of a material having a predetermined reflectivity, and a cladding made of a material having a different reflectance from the core.

In order to prevent deterioration of the optical fiber 110, a metal material such as aluminum (Al), copper (Cu), or tin (Sn) having good heat resistance may be coated on the outer circumferential surface of the cladding.

The optical fiber 110 is inserted into the optical fiber coupler 120 and inserted into the housing 130. The optical fiber coupler 120 is formed of stainless steel or an inconel alloy, It is possible to safely protect the optical fiber 110 inside, which is excellent in chemical resistance and heat resistance.

In addition, the optical fiber 110 is inserted into the upper portion of the housing 130 by the optical fiber coupler 120, and a space can be formed therein.

In particular, the housing 130 includes a sensor unit 140. The sensor unit 140 is disposed at a position opposite to one end of the optical fiber 110 in the housing 130, And the reaction material is changed in color depending on the concentration of copper ions in the substrate.

Here, the term "opposed" means to be formed to face each other.

At this time, the sensor unit 140 may be coated by impregnating the sol-gel solution by a sol-gel method.

The term "sol-gel method" in the present invention means a method of preparing glass or inorganic oxide powder through a gel in a sol obtained by hydrolyzing an alkoxide or the like.

Generally, the sol-gel is prepared by sol-gelation of a sol or polymer-like sol in the form of particles produced in a solution synthesized based on silicon or a metal alkoxide unit precursor, into a mineral network As a material to be changed, it is hardened through a drying process and its mechanical strength is strengthened so that it can be used as a porous thin film or a coating material.

In addition, the sol-gel process can produce a high homogeneity, a low firing temperature, and a porous polymer membrane by a comparatively simple method. Since the sol-gel process has high resistance to other environmental factors and has excellent light transmittance, .

In one embodiment of the invention a sol as described above - by constructing impregnated with Cu ^{2 +} reactants for Cu ^{2 +} measured in the fluid in the course of durability is formed and the reaction film is good reaction membrane through the gel method, a high temperature · It can be used for a long time under high pressure environment.

In this case, the reactant may be an 8-hydroxyquinoline derivative, more specifically, (E) -4- (8-hydroxyquinolin-2-yl) ((E) -4 - ((8-hydroxyquinolin-2-yl) methyleneamino) -1,5-dimethyl- dimethyl-2-phenyl-1H-pyrazol-3 (2H) -one.

[Chemical Formula 1]

Meanwhile, Formula 1 can be prepared by synthesizing an 8-hydroxyquinoline derivative according to an embodiment of the present invention. For example, Formula 1 can be prepared by the following Reaction Formula 1.

[Reaction Scheme 1]

The sol-gel solution can be prepared by mixing a silica precursor and a silane coupling agent in water or a mixed solvent of water and alcohol, and adding the 8-hydroxyquinoline derivative thereto. Will be described later.

In addition, the housing 130 may include an inlet 131 and an outlet 131 on both sides of the housing to allow fluid to flow into and out of the space inside the housing 130, and an optical fiber 110 And a reflection film 141 for reflecting light incident thereon.

The reflection film 141 is transmitted through the optical fiber 110 and reflects the light transmitted through the sensor unit 140 and enters the optical fiber 110. The reflection film 141 is formed of aluminum (Al), silver (Ag ) And gold (Au).

2 is a configuration diagram of a copper ion concentration measuring system using an optical fiber sensor for measuring the concentration of copper ions in a water quality according to another embodiment of the present invention.

Referring to FIG. 2, a copper ion concentration measuring system according to another embodiment of the present invention will be described in detail.

Referring to FIG. 2, the copper ion concentration measuring system according to another embodiment of the present invention includes an optical fiber sensor 100 having a reactant material changing in color depending on copper ions in the water; An optical coupler 300 connected at the other end of the optical fiber 110 of the optical fiber sensor 100; A light source 400 connected to the optical coupler 300 through a first optical fiber 212 and emitting light having a predetermined wavelength; And a second optical fiber 212 connected to the optical coupler 300 through a second optical fiber 212. The optical fiber 212 detects light transmitted through the second optical fiber 212 and converts the light into an electrical signal, An optical signal processing unit 500 for outputting an optical signal; An output unit 600 receiving the copper ion concentration value output from the optical signal processing unit 500 and outputting the copper ion concentration value to the outside; And a copper ion concentration measuring system including the copper ion concentration measuring system.

The fiber optic sensor 100 includes a light transmitted through an optical fiber to a changed Cu ^{2 +} reactant color by reaction with the introduced fluid to a housing 130, the space is inserted into the housing 130, through inlet 131, And transmits the light whose wavelength is changed while the projected light is transmitted through the Cu ^{2 +} reactive material, through the optical fiber again, and transmits the light.

As described above, the optical fiber 110 extending from the optical fiber sensor 100 is formed by coating a metal material on the surface of the cladding constituting the optical fiber so as to withstand a high-pressure and high-temperature environment. Thereby increasing the cost.

The optical fiber 110 is connected to the optical fiber 110 extending to the rear end of the optical fiber sensor 100. The optical fiber 110 is connected to the optical fiber 110, A relatively inexpensive glass optical fiber 210 or a plastic optical fiber can be connected using the optical fiber 200.

In the copper ion concentration measuring system using the optical fiber sensor 100 according to an embodiment of the present invention, the light emitted from the light source 400 is emitted to the optical coupler 300 through the first optical fiber 212 The transmitted light is transmitted to the optical fiber sensor 100 through the optical fiber 110 connected to the optical coupler 300. The light whose wavelength is changed in accordance with the copper ion in the fluid in the optical fiber sensor 100 is again transmitted through the optical fiber 110 And only the light having the changed wavelength is selected and transmitted to the optical signal processing unit 500 through the second optical fiber 214. In this case,

Then, the optical signal processing unit 500 detects the light transmitted through the second optical fiber 214 and outputs the value of Cu ^{2 +} of the fluid by spectroscopically analyzing the detected light, of Cu ^{2 +} concentration value is output in real time to the outside through an output unit 600. At this time, a computer or the like can be used as the output unit.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples.

However, the following Examples and Experimental Examples are merely illustrative of the present invention, and the present invention is not limited to the following Examples and Experimental Examples.

< Example >

Example  1. 8- Hydroxyquinoline (8- hydroxyquinoline ) Preparation of derivative compounds

1-1. Reagents and devices

Aldrich products were used as 8-hydroxyquinoline-2-carboxylic acid, 4-aminoantipyrine and acetonitrile and ethanol as solvents .

TMOS (Tetramethyl orthosilicate) was purchased from Aldrich as a silica precursor and MTMS (Methytrimethoxysilane) was purchased from Aldrich as a silane coupling agent to prepare a sol-gel sensor.

1-2. Synthesis of 8-hydroxyquinoline (8-hydroxyquinoline) derivative

Hydroxyquinoline-2-carboxylic acid (170 mg) and 1 mmol (4 mmol) of 4-aminoantipyrine were dissolved in 20 ml of ethanol at a ratio of 1: 1.

After 1 hour, when the reaction was completed, the solvent was removed under reduced pressure, washed with ethanol to remove impurities, and the precipitate filtered on the filter paper was dried in air to obtain an 8-hydroxyquinoline derivative as shown in Scheme 1 below .

More specifically, by reacting 8-hydroxyquinoline-2-carboxylic acid with 4-aminoantipyrine, (E) -4 - ((8-hydroxyquinolin- Phenyl-1H-pyrazol-3 (2H) -one ((E) -4 - ((8-hydroxyquinolin-2-yl) methyleneamino) -1,5-dimethyl- (2H) -one.

[Reaction Scheme 1]

1-3. Manufacture of sensor

In this Example, a sol-gel sensor for measuring the copper ion concentration was prepared using the 8-hydroxyquinoline derivative obtained in Example 1-2.

The reaction membrane of the sensor used a sol-gel mechanism, and 24 ml of TMOS (TetraEthyl OrthoSilicate) as a silica precursor and 6 ml of MTMS (Methyltrimethoxysilane) as a silane coupling agent were mixed in a mixed solvent of water and alcohol as a sol-gel solution.

At this time, 0.1785 g of the derivative was dissolved in 40 ml of the acetonitrile solution of the synthesized derivatives of TMOS, MTMS, EtOH, and ultrapure water in a volume ratio of 4: 1: 5: 1.25, and 5.0 × 10 ^-4 M host solution was mixed. The solution was stirred at room temperature for 3 hours and then stored at room temperature for 24 hours. The mixture was heated and stirred at 60 ° C for 3 hours. The mixture was sealed and allowed to stand at room temperature for 1 day.

The prepared sol-gel solution was coated on a slide glass, dried at room temperature for 3 days, and dried at room temperature in a desiccator equipped with silica gel for 7 days to prepare a sol-gel sensor.

100: Fiber optic sensor
110: optical fiber 111: optical fiber once
120: fiber optic connection
130: housing 131: inlet / outlet
140: Sensor part 141:
200: optical connector 210: glass optical fiber
212: first optical fiber 214: second optical fiber
300: Optocoupler 400: Light source
500: Optical signal processing unit 600: Output unit

Claims (9)

An optical fiber for transmitting light;
A housing into which one end of the optical fiber is inserted and in which a space is formed; And
A sensor unit formed at a position opposite to one end of the optical fiber in the housing and impregnated with a reactive material that changes color depending on the concentration of copper ions in the fluid in reaction with the fluid; A fiber optic sensor for measuring the concentration of copper ions in water.
The method according to claim 1,
The housing
And an inlet and an outlet are provided on both sides of the housing to allow the fluid to flow in and out of the space.
The method according to claim 1,
The housing
And a reflection film for reflecting the light incident through the optical fiber inside the optical fiber sensor.
The method of claim 3,
The reflective film
Wherein the optical fiber is formed of any one metal selected from the group consisting of aluminum (Al), silver (Ag), and gold (Au).
The method according to claim 1,
The sensor unit
Wherein the 8-hydroxyquinoline derivative is impregnated with an 8-hydroxyquinoline derivative.
6. The method of claim 5,
The 8-hydroxyquinoline derivative is an 8-hydroxyquinoline derivative
(E) -4 - ((8-hydroxyquinolin-2-yl) -methyleneamino) -1,5-dimethyl- ((E) -4 - ((8-hydroxyquinolin-2-yl) methyleneamino) -1,5-dimethyl-2-phenyl-1H-pyrazol-3 (2H) -one.

[Chemical Formula 1]

6. The method of claim 5,
The sensor unit
Sol-gel solution.
8. The method of claim 7,
The sol-gel solution
Wherein a silica precursor and a silane coupling agent are mixed in water or a mixed solvent of water and alcohol, and the 8-hydroxyquinoline derivative is added thereto.
9. A system for measuring the concentration of copper ions in water using an optical fiber sensor according to any one of claims 1 to 8,
An optical fiber sensor in which a reaction material whose color changes according to copper ions in a water quality is formed;
An optical coupler connected at the other end of the optical fiber of the optical fiber sensor;
A light source connected to the optical coupler through a first optical fiber and emitting light having a predetermined wavelength;
An optical signal processing unit connected to the optical coupler via a second optical fiber for detecting light transmitted through the second optical fiber and converting the light into an electric signal and outputting a copper ion value in the water quality using the converted electric signal; And
An output unit for receiving the copper ion concentration value output from the optical signal processing unit and outputting the copper ion concentration value to the outside; Wherein the copper ion concentration measuring system comprises:

Images